Rim-stretching device.



i N K VI f,

A. ROSENBLATT. RIM STRETCHING DEVICE.

APPLICATION FILED AuG.I. |916.

1,219,160. PaIIenIedMar. I3, 1917.

kSTATES miren OFFICE@ .RIM-s'rREToHINGpEvLoE.

To cZZ whom it may concern:

Be it known ythat I, AARON ROSENBLATT, a citizen of the UnitedStates, residing in Philadelphia, Pennsylvania, have invented a Rim-Stretching Device, Vof Awhich the ifellowing is a specification.

@ne Object ofthis invention fis to provide aninstrument for accuratelystretching the so-calledshell ,rims for eye glassesto bring themlto a .predetermined diameter at which they may be easilyput in yplace around `or mounted upon the lenses the invention contemplating an .arrangement of parts which in addition .to-theabove use may be employed. as a holding` device or viselfor eye glasses while they are being .adjusted or otherwise operated upon.

I further desire=to.provide a simple, substantial and inexpensive instrument of the character above noted withmeanswhereby it may be adjusted to accurately predetermine the amount of expansion or stretching to be given to a rim.y

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings, in which,

Figure l is a side elevation of a rim stretching device constructed in accordance with my invention;

Figs. 2 and 3 are transverse sections on the lines 2 2 and 3 3, Fig. 1; and

Fig. t is a slightly modified form of my instrument.

In the above drawings 1 11 represents a pair of similar bars made of suitable material such as wood or metal, which in the case illustrated are of half-round section and pivoted together so that one pair of their ends 5 and 5a is normally-held in engagement, for which purpose each of them has fixed to it a U-shaped body 2 of relatively stiff material constituting a fulcrum or pivot member. The free ends of these fulcrum members are connected by a pivot pin 3 on which is mounted a coiled spring 4 whose extremities respectively engage the two bars 1 1a so as to hold their ends 5 and 5 nor mally in engagement.

In that form of my invention shown in Fig. 1, I provide the bars l and 1a with a, device situated between the ends 5 and 5a and the pivot members 2 whereby the possible amount of separation of said ends may predetermined and accurately limited.

For this purpose I mount on one of said with said nut, the

speciacaion of Letters .Patent Patented Mar. 13, .1917. Application led August 1, 1916. .-SerialNo. 112,562.

bars l arod 6; preferably so that it is free to i swing to `a limited extent, .and extend it through an opening inthe other bar, threading on its outer enda nut 7 This rod in `addition to its threads is V: provided with notches constituting graduations in inches or centimeters` and fractions thereof, designed to indicatefthe Aamount' 0f separationo-f the. ends 5 5il when thebar 1 engages the nut 7.

g'Ihe ends 5 and 5a are,preferablyprovided ,with some means such yas notches `8 in their externalor outermostportions ydesigned to f has shown the rim must be'stretched in order to 1 be :properly mounted on Celluloid or other rim after being softened the lens. The

as by being placed in a suitably heated liquid at the desired temperature= is thereafter placed over the ends 5 so that it rests in one of the notches 8.

By forcing together the opposite endsV of the bars or members l and la against the action of the sprinQ 4, the ends 5 and 5a are forcibly separated to an extent dependent upon the previous adjustment of the nut 7. l/Vhen the end 5a comes into engagement rim which rests in the notches S has been stretched to the desired diameter so that it may be easily placed around the periphery of the lens, which it tightly grips in the desired manner when itV cools. v

Without departing from my invention I may mount the movement limiting' device for determining the amount of stretching to be given to the rim, at the opposite or handle end of the-instrument as sho'wn in Fig. 4, and while I may employ a graduated screw as before, I preferably pivot or iX a flat scale 6a to the handle portion of the bar lb and extend it through a suitable opening in the corresponding portion of the bar 1. The adjustable nut in such case may be re placed by a spring slider 7 operative on the scale between the bars lc and lb and so formed that as before the amount of Vseparation of the ends 5h and 5c may be definitely 'predetermined in order that a rim carried by them shall receive a predetermined stretching or expansion when 'the handle pertions of the bars are moved together until the bar lC comes into engagement With the slide 7a.

Obviously other means than the notches 8 may be employed for holding the `rim m While iti's being' ,stretched For eXample, IYV

may form the bars l and 1c as indicated 1n Fig. 4, so that their engaging'extremities 5V and 5C are'provided with noses or projections 'which will prevent the rim to be stretched Vfrom being' displaced when the 'bars or han-V 'dle members are operated as above descrlbed,

l have found the instrument made in ac- YVcordanee with my invention to be available Yas a convenient means for holding' an-eye glass or eye glass frame during assembly or adjustment. For this purpose said instrn- 1 ment Yis laid on its side on a suitable sup- Copies of this patent may be obtained for veeents bar in engagement with the corresponding' end of the other bar; a graduated member".

connected to one of the bars; and an adjustable element-on said graduated member placed'to engage the other bar to limit the separation of the normally engaged ends ci the bars.

2. The combination of a pair of bars having means for holding inV place a rim to he stretehed; means for pivotallyv connecting the bars; a graduated spindle mounted en one of the bars and extending' through the other; anda nut adjustable on the spindle to limit the amountro'f separation of the rim supporting ends ofthe bars.

A rim stretching device consisting' of a pairot' bars having' means on a pair of adja-y cent ends for retaining' thereon a rim to be stretched; U-shaped members respectively ixed to said bars; a pivot connecting the free ends of said members; a spring on the pivot acting on the bars to normally 'fierce' together their rim engaging ends; and means for positively limiting the amount of separation of said'rim engaging ends ofthe bars. I

AARON ROSENBLA'LET.

each, by addressing the Commissioner of Patents.

r Washington, D. G. 

